Regenerative furnace.



nu. 705,979. Patented muy 29, |902. F. H. TREAT.

REGENERATIVE FURNAGE. (Application led Nov. 14, 1901.)

(No Moc-19|.) 2 Sheets-Sheet I.

Patented luly 29; i902. F. H. TREAT.

REGENERATIVE FURNACE.

(Application led Nov. 14, 1901.)

2 Sheets--Shee 2.

{No ModeL) UNITED STATES PATENT OFFICE..

FRANCIS H. TREAT, OF-PITTSBURG,PENNSYLVANIA.

REG EN E'RATIVE' FU RNAC E.

SPECIFICATION forming part Of Letters Patent N0. 705,978, dated July 29, 1902.

Application lecl November 14,1901. Serial No. 82,218. (No model.)

To all whom it may concern: l

Be it known that I, FRANCIS H. TREAT, of Pittsburg, Allegheny county, Pennsylvania,

have invented a -new and useful Regenerative` Furnace, of which the following is a full, clear, an'd exact description, reference being had to the accompanying drawings, forming part of this specification, in Which-an Figure l is a plan View of a series of three regenerative pit-furnaces in horizontal section on the lines X X, Y Y, and Z Z of Fig. 8 constructed in accordance with` my invention.

Fig. 2 is a perspective View of the air-fines,

the walls of the furnace being broken away.

gig. 3 is a cross-section on the lineIIl III'of My invention relates to that class of furnaces wherein single-surface regenerators are used and is designed to arrange the regenerative flues and checker-work in compact form, so that a series of furnaces ywith their vregenerators may be placed side by side, each fur nace being independent of the others.

Heretofore in the class of pitfurnaces a series of furnaces have been combined with a single set of regenerators, and it has been found dilhcult to keep the different furnaces at the proper heat, some of the furnaces working too cold and others too hot. My invention overcomes this difficulty by combining with each furnace a self=-contained regenera-` tive system.

In the drawings, in which 1 show a preferred form of the invention, 2 represents'a pit-fur nace having at each end a gas=regenerative chamber 3 and an outer air e regenerative chamber 4. The air-regeuerator on the air side is provided with a flue 5, leading out-` wardly and thence upwardly into a valve-casn ing 6. Within this casing is a reversing butterfly-Valve 7, which controls a central iue d, leading downwardly to the chimney-flue 9, and outside of iiue 8 is a flue 10, which iu its lower portion extends laterally and thence downwardly and extends beneath the furnace to the air-regenerator upon the opposite side of the furnace. The air-valve casing is provided with a valve 1l in its open top, which controls the supply of air flowing into the casing.

The gas-valve casing 12 is similar to that of the air-valve, but is inclosed in a gasbc1 13, to which the gas-supply pipe leads. The reversingeval've 14 and the gas-valve casing are similar to the other reversing-valve and control a gas-port 15, leading downwardly and horizontally under the furnace and opening into the. opposite gas-regenerator. The central iiue 16 on the gas side leads to a chimney-flue 17, and the rear line 18 is offset laterally and thence extends downwardly and en ters the lower portion of the gas-regenerator on the same side of the furnace.

In the operation of the furnace when the valves are in the position shown in Fig. 3 gas passes into the gas-valve casing and is'directed into the rear gas-flue, whence itpasses into the gas-regenerator on the same side of the furnace.` At the same time air enters the airh valve casing on the opposite side of the furnace, enters the outside flue therein, passes down beneath the furnace and into the air-regenerator on the gas side, as shown in Fig. 1 by the arrows.' The air and gas passing up through the two regenerators on the gas side are ignited in the usual manner, and theproducts of combustion pass through the furnace and down through the air and gas regenerators on the air side. That portion of the products passing down through the air-regenerator flows oninto the air-valve casing and thence down into the chimney-iiue,while the products passing down through the gasregenerator flow into the liuc extending beneath the furnace, thence upwardly into the gasvalve casing,and downwardlyytothe otherchimney-iiue. When the air and gas valves are reversed, air flows intothe airvalve casing and thence directly into the air-regenerator on the same side. At the same time gas iiows in through the gasa valve casing and passes to the inner flue and The advantages of my invention result from the peculiar arrangement of the regenerative flues. This system of flues gives a compactness which enables each furnace to be provided with its own regenerative system, While allowing the furnaces to be placed side by side and extended in a line to any desired number.

Many variations may be made in the form and arrangement of the furnace, the regenerators, the system of flues, and the valves air regenerators arranged in pairs on each side thereof, a reversing air-valve on one side, a reversing gas-valve on the other side, one of each pair of regenerators having a flue leading beneath the furnace to the valve on the other side thereof, while the other of said pair has a flue connection to the valve on the same side; substantially as described.

3. A regenerative furnace having gas and air regenerators arranged in pairs on eac-h side thereof, an air-valve casing on one side having three ues, one leading to the chimney-iiue, another to the air-regenerator on the same side of the furnace, and the third leading to the air-regeneratoron the opposite side of the furnace, and a gas-valve casing having three dues, one leading to the gas-regenerator on the same side, one to the chimney- Hue, and the third to the gas-regenerator on the opposite side,and reversing-valves within the valve-casings; substantially as described.

4. A regenerative furnace having a pair of regenerators on each side thereof, one of each pair being a gas-regenerator and the other an air-regenerator, three ues on one side of the furnace, one leading to the chimney-flue, another to the air-regenerator on the same side, and the third to the air-regenerator on the opposite side, three iiues on the other side of the furnace, one a chimney-flue, the second leading to the gas-regenerator on the same side, and the third leading to the gas-regenerator on the'opposite side, and valve mechanism for reversing the flow to the regener ators; substantially as described.

In testimony whereof I have hereunto set my hand.

FRANCIS H. TEAT.

Witnesses:

H. M. GORWIN, L. M. REDMAN. 

